package edu.hziee.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5String {

	/** 
	 * MD5 加密 
	 */  
	public static String getMD5Str(String str) {  
		MessageDigest messageDigest = null;  

		try {  
			messageDigest = MessageDigest.getInstance("MD5");  

			messageDigest.reset();  

			messageDigest.update(str.getBytes("UTF-8"));  
		} catch (NoSuchAlgorithmException e) {  
			System.out.println("NoSuchAlgorithmException caught!");  
			System.exit(-1);  
		} catch (UnsupportedEncodingException e) {  
			e.printStackTrace();  
		}  

		byte[] byteArray = messageDigest.digest();  

		StringBuffer md5StrBuff = new StringBuffer();  

		for (int i = 0; i < byteArray.length; i++) {              
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)  
				md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));  
			else  
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));  
		}  

		return md5StrBuff.toString();  
	} 
}
